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Lines of Credit and Debt (Narrative) (Details) Share data in Millions, except Per Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 EUR (€) | Dec. 31, 2012 Senior Unsecured Notes [Member] USD ($) | Dec. 31, 2012 Senior Unsecured Notes [Member] EUR (€) | Oct. 12, 2012 Senior Unsecured Notes [Member] USD ($) | Dec. 31, 2012 Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member] Senior Unsecured Notes [Member] USD ($) | Oct. 12, 2012 Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member] Senior Unsecured Notes [Member] USD ($) | Dec. 31, 2011 Series A Senior Notes, 3.19% Interest Rate, Due October 16, 2019 [Member] Senior Unsecured Notes [Member] USD ($) | Dec. 31, 2012 Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member] Senior Unsecured Notes [Member] USD ($) | Oct. 12, 2012 Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member] Senior Unsecured Notes [Member] USD ($) | Dec. 31, 2011 Series B Senior Notes, 3.75% Interest Rate, Due October 16, 2022 [Member] Senior Unsecured Notes [Member] USD ($) | Dec. 31, 2012 Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member] Senior Unsecured Notes [Member] USD ($) | Oct. 12, 2012 Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member] Senior Unsecured Notes [Member] USD ($) | Dec. 31, 2011 Series C Senior Notes, 3.90% Interest Rate, Due October 16, 2024 [Member] Senior Unsecured Notes [Member] USD ($) | Dec. 31, 2012 Convertible Notes 3.25% Due in 2026 [Member] QIAGEN Euro Finance [Member] USD ($) | Dec. 31, 2011 Convertible Notes 3.25% Due in 2026 [Member] QIAGEN Euro Finance [Member] USD ($) | May 31, 2006 Convertible Notes 3.25% Due in 2026 [Member] QIAGEN Euro Finance [Member] USD ($) | Dec. 31, 2012 Convertible Notes 1.5% Due in 2024 [Member] QIAGEN Finance [Member] USD ($) | Dec. 31, 2011 Convertible Notes 1.5% Due in 2024 [Member] QIAGEN Finance [Member] USD ($) | Aug. 31, 2004 Convertible Notes 1.5% Due in 2024 [Member] QIAGEN Finance [Member] USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, revolving credit, amount | $ 577,900,000 |  |  | € 438,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Multi-Currency Term Loan |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lines of credit |  |  |  | 38,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate, minimum | 0.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate, maximum | 2.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Commitment Fee Calculation Basis On Applicable Margin, Percentage | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Commitment Fee Amount | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 400,000,000 |  | 73,000,000 |  |  | 300,000,000 |  |  | 27,000,000 |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  |  |  |  |  |  | 3.66% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rates |  |  |  |  |  |  |  | 3.19% | 3.19% |  | 3.75% | 3.75% |  | 3.90% | 3.90% |  |  |  | 3.25% |  |  | 1.50%
Debt Instrument, Term |  |  |  |  |  |  |  | 7 years |  |  | 10 years |  |  | 12 years |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs | 2,084,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  |  |  |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt | 400,000,000 | 44,000,000 | 3,016,000 |  | 220,000,000 | 170,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 846,992,000 | 447,622,000 |  |  |  |  |  | 73,000,000 |  | 0 | 300,000,000 |  | 0 | 27,000,000 |  | 0 | 300,000,000 | 300,000,000 |  | 145,000,000 | 145,000,000 |
Less current portion | 948,000 | 1,617,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, long-term debt | 17,400,000 | 22,100,000 | 24,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  | 150,000,000
Effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.70% |  |  | 1.80% |  |
Percent of note issued principal value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |
Convertible into common shares at the option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.0 |  |  | 11.5 |  |
Debt instrument, convertible, conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.00 |  |  | $ 12.6449 |  |
Debt Instrument Call Feature, Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |
Percentage of provisional call trigger price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  | 120.00% |  |
Debt instrument, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 358,400,000 |  |  | $ 209,700,000 |  |

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- Definition When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1930-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 26, 27, 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Aggregate amount of interest paid or due on all long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Chapter V -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585 + Details
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